Abstract
The paper presents the development of a "proof of principle" hands-free and self-contained diagnostic platform for detection of human papillomavirus (HPV) E6/E7 mRNA in clinical specimens. The automated platform performs chip-based sample pre-concentration, nucleic acid extraction, amplification and real-time fluorescent detection with minimal user interfacing. It consists of two modular prototypes, one for sample preparation and one for amplification and detection; however, a common interface is available to facilitate later integration into one single module. Nucleic acid extracts (n=28) from cervical cytology specimens extracted on the sample preparation chip were tested using the PreTect® HPV-Proofer and achieved an overall detection rate for HPV across all dilutions of 50-85.7%. A subset of 6 clinical samples extracted on the sample preparation chip module was chosen for complete validation on the NASBA chip module. For 4 of the samples a 100% amplification for HPV 16 or 33 was obtained at the 1:10 dilution for microfluidic channels that filled correctly. The modules of a "sample-in, answer-out" diagnostic platform have been demonstrated from clinical sample input through sample preparation, amplification and final detection.
